Lamp base



FIG. 1 is a front perspective view from below and to one side of a lampbase showing the new design, a lamp chimney shown in phantom to show thecontext of use.

FIG. 2 is a front elevational view of the lamp base of FIG. 1, the back,right, and left elevational views being identical thereto.

FIG. 3 is a top plan view of the lamp base of FIG. 1; and,

FIG. 4 is a bottom plan view of the lamp base of FIG. 1.

The ornamental design for a lamp base, as shown and described.